I have been using Qubicle and have saved a file withing the google drive synced folder on my hard drive.
The second time I came to save the file, it did not allow me to do so, and came up with an error saying the file was already in use. I therefore saved it as another name, within the drive folder.

I have since closed down Qubicle. Now whenever I try to open it, the attached image error appears and does not let me run the programme at all. I am not trying to open the file it is suggesting in the error, but simply trying to run the programme from the desktop shortcut.